Depression and low self-esteem function to negatively bias how we believe we are seen by others in new acquaintanceships and therefore may play an important role in the development of interpersonal relationships.

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Metaperception involves making judgments regarding what others think of us and is important in navigating the social world. We measured the degree of accuracy and bias in metaperceptions of liking and desire for future contact following unstructured social interactions with new acquaintances and tested how depression and self-esteem influence bias and accuracy in these judgments. Results indicated that depression and lower self-esteem are associated with negative directional biases but are also associated with lower reciprocity bias (the tendency to assume that partners return one’s feelings of liking and acceptance). In addition, individuals with lower self-esteem displayed greater meta-insight (accuracy when controlling for bias) compared with those with higher self-esteem. Implications for cognitive and depressive realism theories of depression are discussed.

The first nuclear excited state in 229Th possesses the lowest excitation energy of all currently known nuclear levels. The energy difference between the ground- and first-excited (isomeric) state (denoted with 229mTh) amounts only to ≈8.2 eV (≈151.2 nm), which results in several interesting consequences: Since the excitation energy is in the same energy range as the binding energy of valence electrons, the lifetime of 229mTh is strongly influenced by the electronic structure of the Th atom or ion. Furthermore, it is possible to potentially excite the isomeric state in 229Th with laser radiation, which led to the proposal of a nuclear clock that could be used to search for new physics beyond the standard model. In this article, we will focus on recent technical developments in our group that will help to better understand the decay mechanisms of 229mTh, focusing primarily on measuring the radiative lifetime of the isomeric state.

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